ペロブスカイト型A Fe_<1-X>Co_xO_3(A=Sr, Ca)の強磁性 Ferromagnetic Properties of A Fe_<1-x>Co_xO_3(A=Sr, Ca)

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AFe<SUB>1-x</SUB>Co<SUB>x</SUB>O<SUB>3-δ</SUB> (A=Sr, Ca) with minimized oxygen deficiency was prepared using high pressure technique. An oxider KCIO<SUB>4</SUB> was encapsulated with the sample powder. The Co-substitution makes Fe<SUB>3d</SUB> electrons of AFeO<SUB>3</SUB> more delocalized and induces metallic conduction and ferromagnetism. Cubic SrFe<SUB>1-x</SUB>Co<SUB>x</SUB>O<SUB>3</SUB> shows ferromagnetism above 300 K for 0.4≤x≤0.9. From the composition dependence of unit cell volume, a possibility of negative magnetovolume effect has been raised. In orthorhombic CaFe<SUB>1-x</SUB>Co<SUB>x</SUB>O<SUB>3</SUB> (0≤x≤0.5) Fe<SUB>3d</SUB> electrons seem to be more localized as judged from the magnetic hyperfine field measured by Mossbauer spectroscopy, and T<SUB>c</SUB> is lower and the magnetization is smaller in comparison with the Sr-analogue. These seem to indicate that the σ<SUP>*</SUP> band is narrow in the Ca-phase because the Fe-O-Fe band is bent to -150.

収録刊行物

  • 粉体および粉末冶金

    粉体および粉末冶金 43(8), 1001-1006, 1996-08-15

    Japan Society of Powder and Powder Metallurgy

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各種コード

  • NII論文ID(NAID)
    10002012828
  • NII書誌ID(NCID)
    AN00222724
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    05328799
  • NDL 記事登録ID
    4012524
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z17-274
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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